/*
 * JavaScript MD5
 * https://github.com/blueimp/JavaScript-MD5
 *
 * Copyright 2011, Sebastian Tschan
 * https://blueimp.net
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 *
 * Based on
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/* global define */

;(function ($) {
    'use strict';
    /*
     * Add integers, wrapping at 2^32. This uses 16-bit operations internally
     * to work around bugs in some JS interpreters.
     */
    function safeAdd (x, y) {
        var lsw = (x & 0xFFFF) + (y & 0xFFFF);
        var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
        return (msw << 16) | (lsw & 0xFFFF);
    }

    /*
     * Bitwise rotate a 32-bit number to the left.
     */
    function bitRotateLeft (num, cnt) {
        return (num << cnt) | (num >>> (32 - cnt));
    }

    /*
     * These functions implement the four basic operations the algorithm uses.
     */
    function md5cmn (q, a, b, x, s, t) {
        return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b);
    }
    function md5ff (a, b, c, d, x, s, t) {
        return md5cmn((b & c) | ((~b) & d), a, b, x, s, t);
    }
    function md5gg (a, b, c, d, x, s, t) {
        return md5cmn((b & d) | (c & (~d)), a, b, x, s, t);
    }
    function md5hh (a, b, c, d, x, s, t) {
        return md5cmn(b ^ c ^ d, a, b, x, s, t);
    }
    function md5ii (a, b, c, d, x, s, t) {
        return md5cmn(c ^ (b | (~d)), a, b, x, s, t);
    }

    /*
     * Calculate the MD5 of an array of little-endian words, and a bit length.
     */
    function binlMD5 (x, len) {
        /* append padding */
        x[len >> 5] |= 0x80 << (len % 32);
        x[(((len + 64) >>> 9) << 4) + 14] = len;

        var i;
        var olda;
        var oldb;
        var oldc;
        var oldd;
        var a = 1732584193;
        var b = -271733879;
        var c = -1732584194;
        var d = 271733878;

        for (i = 0; i < x.length; i += 16) {
            olda = a;
            oldb = b;
            oldc = c;
            oldd = d;

            a = md5ff(a, b, c, d, x[i], 7, -680876936);
            d = md5ff(d, a, b, c, x[i + 1], 12, -389564586);
            c = md5ff(c, d, a, b, x[i + 2], 17, 606105819);
            b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330);
            a = md5ff(a, b, c, d, x[i + 4], 7, -176418897);
            d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426);
            c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341);
            b = md5ff(b, c, d, a, x[i + 7], 22, -45705983);
            a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416);
            d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417);
            c = md5ff(c, d, a, b, x[i + 10], 17, -42063);
            b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162);
            a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682);
            d = md5ff(d, a, b, c, x[i + 13], 12, -40341101);
            c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290);
            b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329);

            a = md5gg(a, b, c, d, x[i + 1], 5, -165796510);
            d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632);
            c = md5gg(c, d, a, b, x[i + 11], 14, 643717713);
            b = md5gg(b, c, d, a, x[i], 20, -373897302);
            a = md5gg(a, b, c, d, x[i + 5], 5, -701558691);
            d = md5gg(d, a, b, c, x[i + 10], 9, 38016083);
            c = md5gg(c, d, a, b, x[i + 15], 14, -660478335);
            b = md5gg(b, c, d, a, x[i + 4], 20, -405537848);
            a = md5gg(a, b, c, d, x[i + 9], 5, 568446438);
            d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690);
            c = md5gg(c, d, a, b, x[i + 3], 14, -187363961);
            b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501);
            a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467);
            d = md5gg(d, a, b, c, x[i + 2], 9, -51403784);
            c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473);
            b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734);

            a = md5hh(a, b, c, d, x[i + 5], 4, -378558);
            d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463);
            c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562);
            b = md5hh(b, c, d, a, x[i + 14], 23, -35309556);
            a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060);
            d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353);
            c = md5hh(c, d, a, b, x[i + 7], 16, -155497632);
            b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640);
            a = md5hh(a, b, c, d, x[i + 13], 4, 681279174);
            d = md5hh(d, a, b, c, x[i], 11, -358537222);
            c = md5hh(c, d, a, b, x[i + 3], 16, -722521979);
            b = md5hh(b, c, d, a, x[i + 6], 23, 76029189);
            a = md5hh(a, b, c, d, x[i + 9], 4, -640364487);
            d = md5hh(d, a, b, c, x[i + 12], 11, -421815835);
            c = md5hh(c, d, a, b, x[i + 15], 16, 530742520);
            b = md5hh(b, c, d, a, x[i + 2], 23, -995338651);

            a = md5ii(a, b, c, d, x[i], 6, -198630844);
            d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415);
            c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905);
            b = md5ii(b, c, d, a, x[i + 5], 21, -57434055);
            a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571);
            d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606);
            c = md5ii(c, d, a, b, x[i + 10], 15, -1051523);
            b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799);
            a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359);
            d = md5ii(d, a, b, c, x[i + 15], 10, -30611744);
            c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380);
            b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649);
            a = md5ii(a, b, c, d, x[i + 4], 6, -145523070);
            d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379);
            c = md5ii(c, d, a, b, x[i + 2], 15, 718787259);
            b = md5ii(b, c, d, a, x[i + 9], 21, -343485551);

            a = safeAdd(a, olda);
            b = safeAdd(b, oldb);
            c = safeAdd(c, oldc);
            d = safeAdd(d, oldd);
        }
        return [a, b, c, d];
    }

    /*
     * Convert an array of little-endian words to a string
     */
    function binl2rstr (input) {
        var i;
        var output = '';
        var length32 = input.length * 32;
        for (i = 0; i < length32; i += 8) {
            output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF);
        }
        return output;
    }

    /*
     * Convert a raw string to an array of little-endian words
     * Characters >255 have their high-byte silently ignored.
     */
    function rstr2binl (input) {
        var i;
        var output = [];
        output[(input.length >> 2) - 1] = undefined;
        for (i = 0; i < output.length; i += 1) {
            output[i] = 0;
        }
        var length8 = input.length * 8;
        for (i = 0; i < length8; i += 8) {
            output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32);
        }
        return output;
    }

    /*
     * Calculate the MD5 of a raw string
     */
    function rstrMD5 (s) {
        return binl2rstr(binlMD5(rstr2binl(s), s.length * 8));
    }

    /*
     * Calculate the HMAC-MD5, of a key and some data (raw strings)
     */
    function rstrHMACMD5 (key, data) {
        var i;
        var bkey = rstr2binl(key);
        var ipad = [];
        var opad = [];
        var hash;
        ipad[15] = opad[15] = undefined;
        if (bkey.length > 16) {
            bkey = binlMD5(bkey, key.length * 8);
        }
        for (i = 0; i < 16; i += 1) {
            ipad[i] = bkey[i] ^ 0x36363636;
            opad[i] = bkey[i] ^ 0x5C5C5C5C;
        }
        hash = binlMD5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
        return binl2rstr(binlMD5(opad.concat(hash), 512 + 128));
    }

    /*
     * Convert a raw string to a hex string
     */
    function rstr2hex (input) {
        var hexTab = '0123456789abcdef';
        var output = '';
        var x;
        var i;
        for (i = 0; i < input.length; i += 1) {
            x = input.charCodeAt(i);
            output += hexTab.charAt((x >>> 4) & 0x0F) +
                hexTab.charAt(x & 0x0F);
        }
        return output;
    }

    /*
     * Encode a string as utf-8
     */
    function str2rstrUTF8 (input) {
        return unescape(encodeURIComponent(input));
    }

    /*
     * Take string arguments and return either raw or hex encoded strings
     */
    function rawMD5 (s) {
        return rstrMD5(str2rstrUTF8(s));
    }
    function hexMD5 (s) {
        return rstr2hex(rawMD5(s));
    }
    function rawHMACMD5 (k, d) {
        return rstrHMACMD5(str2rstrUTF8(k), str2rstrUTF8(d));
    }
    function hexHMACMD5 (k, d) {
        return rstr2hex(rawHMACMD5(k, d));
    }

    function md5 (string, key, raw) {
        if (!key) {
            if (!raw) {
                return hexMD5(string);
            }
            return rawMD5(string);
        }
        if (!raw) {
            return hexHMACMD5(key, string);
        }
        return rawHMACMD5(key, string);
    }

    if (typeof define === 'function' && define.amd) {
        define(function () {
            return md5;
        });
    } else if (typeof module === 'object' && module.exports) {
        module.exports = md5;
    } else {
        $.md5 = md5;
    }
}(this));
